Datasheet

Contents
9
Microstep Resolution Selection
When it’s not in software configured mode, microstep resolution is set by SW5, 6, 7, 8 of the DIP
switch as shown in the following table:
SW5 SW6 SW7 SW8
Micro
step
Pulse/rev SW5 SW6 SW7 SW8
Micro
step
Pulse/rev
ON ON ON ON 1 400 ON ON ON OFF 5 1000
OFF ON ON ON 2 800 OFF ON ON OFF 10 2000
ON OFF ON ON 4 1600 ON OFF ON OFF 20 4000
OFF OFF ON ON 8 3200 OFF OFF ON OFF 25 5000
ON ON OFF ON 16 6400 ON ON OFF OFF 40 8000
OFF ON OFF ON 32 12800 OFF ON OFF OFF 50 10000
ON OFF OFF ON 64 25600 ON OFF OFF OFF 100 20000
OFF OFF OFF ON 128 51200 OFF OFF OFF OFF 125 25000
Current Settings
For a given motor, higher driver current will make the motor to output more torque, but at the same
time causes more heating in the motor and driver. Therefore, output current is generally set to be such
that the motor will not overheat for long time operation. Since parallel and serial connections of
motor coils will significantly change resulting inductance and resistance, it is therefore important to
set driver output current depending on motor phase current, motor leads and connection methods.
Phase current rating supplied by motor manufacturer is important in selecting driver current, however
the selection also depends on leads and connections.
Contents
10
When it’s not in software configured mode, the first three bits (SW1, 2, 3) of the DIP switch are used
to set the dynamic current. Select a setting closest to your motor’s required current.
Dynamic current setting
SW1 SW2 SW3 Peak RMS SW1 SW2 SW3 Peak RMS
ON ON ON 1.0A 0.71A ON ON OFF 3.0A 2.14A
OFF ON ON 1.5A 1.07A OFF ON OFF 3.5A 2.50A
ON OFF ON 2.0A 1.43A ON OFF OFF 4.0A 2.86A
OFF OFF ON 2.5A 1.78A OFF OFF OFF 4.5A 3.21A
Notes: Due to motor inductance, the actual current in the coil may be smaller than the dynamic
current setting, particularly under high speed condition.
Standstill current setting
SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected
dynamic current, and ON meaning that standstill current is set to be the same as the selected dynamic
current.
The current automatically reduced to 60% of the selected dynamic current one second after the last
pulse. Theoretically, this will reduce motor heating to 36% (due to P=I
2
*R) of the original value. If
the application needs a different standstill current, please contact MotionKing.
8. Wiring Notes
z In order to improve anti-interference performance of the driver, it is recommended to use
twisted pair shield cable.
z To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor wires
should not be tied up together. It is better to separate them by at least 10 cm, otherwise the
disturbing signals generated by motor will easily disturb pulse direction signals, causing motor
position error, system instability and other failures.
z If a power supply serves several drivers, separately connecting the drivers is recommended
instead of daisy-chaining.
z It is prohibited to pull and plug connector P2 while the driver is powered ON, because there is
high current flowing through motor coils (even when motor is at standstill). Pulling or plugging
connector P2 with power on will cause extremely high back-EMF voltage surge, which may
damage the driver.